UB3KDU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia

Receiver-side FT8 activity involving UB3KDU, decoded by SO8OO in southeastern Poland. 34 FT8 messages attributed to this token as transmitter, on 20m, across 8 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-07-20.

These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.

SO8OO decoded 34 FT8 messages attributed to UB3KDU as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Several six-hour UTC windows tied for the largest share (91%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's moderate S/N range (65%); the estimated median was -13 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

20m · 34

First attributed message: 2026-06-12
Last attributed message: 2026-07-20 16:55 UTC

Observed FT8 message patterns

Attributed sample: 34 messages
Active dates: 8 UTC dates
Estimated median S/N: -13 dB
Estimated 10th-90th percentile: -17 to -9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 9, moderate (-15 to -9 dB) 22, strong (≥ -8 dB) 3.

WSJT-X defines S/N reports against a 2,500 Hz reference noise bandwidth. The ranges above are SO8OO receiver-side display categories, not official WSJT-X classes, transmitter-power measurements or estimates of how easy the station is to hear elsewhere. Statistics include only successful decodes on SO8OO's monitored FT8 channels; transmissions that were not decoded are absent.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with UB3KDU in decoded directed-looking exchanges:

DO1ID · Fed. Rep. of Germany LZ2II · Bulgaria 3W9A · Vietnam 9J2FI · Zambia CN2DX · Morocco E21EIC · Thailand F1ODM · France HL5YI · Republic of Korea JA0LFV · Japan JA1MJN · Japan JK1ATM · Japan KF0YOB · United States

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Observed FT8 exchanges

S/N cells show: decoded at SO8OO / report transmitted by the counterpart. An observed exchange is not a QSL or an official logbook confirmation.

Time UTC	Band	UB3KDU S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-16 08:02	10m	- / -	DK8EE	-19 / -	2	Partial capture
08-16 07:56	10m	- / -6	DO1ID	+5 / -	3	✓ Closing fragment
07-22 17:22	10m	- / +2	LZ2II	-8 / -	5	✓ Closing fragment
07-20 16:02	20m	-13 / -	E21EIC	- / -13	2	✓ Closing fragment
07-19 18:07	20m	- / -2	JA0LFV	-18 / -	2	✓ Closing fragment
07-19 18:05	20m	-14 / -	5Z4J	- / -14	2	Partial capture
07-19 17:31	20m	-12 / -18	3W9A	-9 / -7	3	✓ Full exchange observed
07-14 18:23	20m	- / -4	F1ODM	-18 / -	2	✓ Closing fragment
07-14 17:58	20m	-15 / -	9J2FI	- / -16	2	✓ Closing fragment
07-14 17:51	20m	-11 / -	PD3CFG	- / -11	2	✓ Closing fragment
07-12 15:57	20m	-16 / -6	YH5NA	-16 / -7	3	✓ Full exchange observed
07-05 19:17	20m	-13 / -	KQ4ZAX	- / -14	2	Partial capture
07-05 19:12	20m	-10 / -	HL5YI	- / -12	2	✓ Closing fragment
07-05 19:01	20m	-12 / -	CN2DX	- / -15	3	✓ Closing fragment
06-28 19:08	20m	-13 / -	RD0L	- / -15	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

10m

UTC    dB Audio  Message
172200  -5 1910  UB3KDU LZ2II R+02 (x5)
075600  +6  447  UB3KDU DO1ID JO41 (x3)
080230 -19 2146  UB3KDU DK8EE JO41 (x2)

20m

UTC    dB Audio  Message
180530 -13  823  5Z4J UB3KDU -14 (x2)
180700 -18 1769  UB3KDU JA0LFV R-02 (x2)
181145 -14  824  JK1ATM UB3KDU RR73
181230 -13  824  4O4DB UB3KDU -08
181400 -13  823  YC2ULK UB3KDU -13
182115 -17 1102  TA4WH UB3KDU RR73
183745  -7 1103  R8LCP UB3KDU 73
160230 -16 1104  E21EIC UB3KDU -13 (x2)
160415 -20 1328  UB3KDU PD2WL JO22 (x2)
163100 -11 2444  UB3KDU RM4N -14
165530 -13 1105  JA1MJN UB3KDU RR73

Decoder S/N history by band

Count-weighted daily averages across messages attributed to this profiled token and successfully decoded at SO8OO, limited to the rolling 90-day UTC chart window.

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